CVE-2015-10094 in Fastly Plugin
Summary
by MITRE • 03/06/2023
A vulnerability was found in Fastly Plugin up to 0.97. It has been rated as problematic. Affected by this issue is the function post of the file lib/api.php. The manipulation of the argument url leads to cross site scripting. The attack may be launched remotely. Upgrading to version 0.98 is able to address this issue. The name of the patch is d7fe42538f4d4af500e3af9678b6b06fba731656. It is recommended to upgrade the affected component. VDB-222326 is the identifier assigned to this vulnerability.
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Analysis
by VulDB Data Team • 03/31/2023
The vulnerability identified as CVE-2015-10094 affects the Fastly Plugin version 0.97 and earlier, representing a significant security weakness that exposes web applications to cross-site scripting attacks. This issue resides within the lib/api.php file, specifically in the post function where improper input validation occurs. The vulnerability is classified as a medium severity issue under the VDB-222326 identifier, with the problem stemming from the inadequate sanitization of the url argument parameter. The flaw allows attackers to inject malicious scripts into web pages viewed by other users, creating a persistent threat vector that can compromise user sessions and data integrity.
The technical implementation of this vulnerability demonstrates a classic cross-site scripting flaw where the url parameter is directly processed without proper validation or encoding mechanisms. When a malicious user submits a crafted url parameter containing script tags or other malicious code, the application fails to sanitize this input before processing, allowing the malicious content to be executed in the context of other users' browsers. This represents a clear violation of secure coding practices and falls under CWE-79, which specifically addresses cross-site scripting vulnerabilities. The remote exploitation capability of this vulnerability means that attackers do not need physical access to the system or local network privileges to carry out attacks, making it particularly dangerous in web-facing applications.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive user data, manipulate application functionality, or redirect users to malicious websites. The vulnerability affects any web application using the affected Fastly Plugin version, potentially compromising thousands of users depending on the scale of the application. Attackers can leverage this weakness to create persistent backdoors, harvest cookies, or execute arbitrary commands on behalf of authenticated users, significantly undermining the security posture of affected systems.
Security remediation for this vulnerability requires immediate upgrading to version 0.98 of the Fastly Plugin, which incorporates the patch identified by the commit hash d7fe42538f4d4af500e3af9678b6b06fba731656. This upgrade addresses the root cause by implementing proper input validation and sanitization mechanisms for the url parameter within the post function. Organizations should also implement additional defensive measures including input validation at multiple layers, output encoding for all dynamic content, and regular security assessments of third-party components. The patch demonstrates adherence to ATT&CK framework techniques related to privilege escalation and defense evasion by addressing the underlying code vulnerability that could be exploited for more sophisticated attacks. Regular monitoring and vulnerability scanning should be implemented to ensure that similar issues are not present in other components of the application stack, maintaining overall system security hygiene.